Script languages: Max. Line Length
Most scripting languages will have long enough limits, if indeed they have a formal limit on the length of lines. POSIX recommends 2048 minimum.
How long are your signatures? Most likely, not more than 1024...in which case, I really wouldn't worry. If it doesn't work for some language, you should report the bug rather than anything else.
Perl also has no fixed maximum line length, other than imposed by memory usage.
In Python, you should not have any problem with line length as long as you have sufficient memory. In PHP, you may be limited by the amount of memory PHP interpreter is allowed to use (set in php.ini)